If the allegation against Cameron is true, it raises questions about what financial and personal motivations the ex-prime minister may’ve had for wanting Uber to operate in London, as well as what ties his office may’ve had with the company.

Uber says it had support throughout London in 2015. A spokesperson for Uber said, “More than 200,000 Londoners signed a petition in autumn 2015 against plans for things like five minute minimum waiting times. [Such plans] were also condemned by consumer groups, the media, and even the Competition and Markets Authority.”

Downing Street and the London Mayor’s office didn’t immediately respond to a request for comment.